but moles can be brown or black. if you have a mole that's not brown, block, red, blue, something that needs to be looked at. d is diameter. we try to tell people that moles, any bigger than the size of an eraser head are just things again that don't belong there. e is evolution. it means that if you were born with a birth mark and over time it changes where it either increases in size or gets itchy, it's something that really also needs to be evaluated. >> gretchen: chris, you're raising your three children ho are now five and how old? >> five, nine and 12. >> gretchen: you've set up this foundation. how can people learn more? >> go to fighting melanoma with style.org. we're holding a fundraising event at the new york stock exchange. there is still tickets available. and you'll find more information on the web site. it's our second fund-raiser at the new york stock exchange and we're very proud of what we're doing and we want to make people aware of the dangers of this disease and what a beast it is and awareness is